From: Dan Carpenter <dan.carpenter@oracle.com>
To: walter harms <wharms@bfs.de>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
Ingo Molnar <mingo@elte.hu>, Joerg Roedel <joerg.roedel@amd.com>,
Thomas Gleixner <tglx@linutronix.de>,
Youquan Song <youquan.song@intel.com>,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] iommu: off by one in dmar_get_fault_reason()
Date: Sun, 13 May 2012 17:12:14 +0000 [thread overview]
Message-ID: <20120513171214.GD16984@mwanda> (raw)
In-Reply-To: <4FAE595A.6010605@bfs.de>
On Sat, May 12, 2012 at 02:36:42PM +0200, walter harms wrote:
>
>
> Am 12.05.2012 12:59, schrieb Dan Carpenter:
> > fault_reason = ARRAY_SIZE(irq_remap_fault_reasons) + 0x20 - 0x20 is one
> > past the end of the array.
> >
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> >
> > diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> > index 5ef65cf..9390f3f 100644
> > --- a/drivers/iommu/dmar.c
> > +++ b/drivers/iommu/dmar.c
> > @@ -1057,7 +1057,7 @@ static const char *irq_remap_fault_reasons[] > >
> > const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type)
> > {
> > - if (fault_reason >= 0x20 && (fault_reason <= 0x20 +
> > + if (fault_reason >= 0x20 && (fault_reason < 0x20 +
> > ARRAY_SIZE(irq_remap_fault_reasons))) {
> > *fault_type = INTR_REMAP;
> > return irq_remap_fault_reasons[fault_reason - 0x20];
>
> perhaps this is more readable:
> if (fault_reason >= 0x20 && (fault_reason - 0x20 < ARRAY_SIZE(irq_remap_fault_reasons)))
>
Yeah. Probably you're way is nicer.
regards,
dan carpenter
prev parent reply other threads:[~2012-05-13 17:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-12 10:59 [patch] iommu: off by one in dmar_get_fault_reason() Dan Carpenter
2012-05-12 12:36 ` walter harms
2012-05-13 17:09 ` [patch v2] " Dan Carpenter
2012-05-13 17:12 ` Dan Carpenter [this message]
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